[issue38901] Add a CLI flag to venv to use the pwd basename as the prompt

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

If it were `.` would we then always check if the prompt was a folder and then use the folder's name in that case? Or would it only apply to `.`?

As for `__curdir__`, it could work, but I don't know how easy would that be to remember or explain to new users compared to `.`?

My vote is to support `.` and make the rule that if you specify a folder it will use the basename automatically.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38901>
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